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This lets us get rid of macro-generated functions and shrinks the
driver size by about 10%. I used a new style suggested by Mark M.
Hoffman to retrieve the channel number. Instead of:

	struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
	int nr = sda->index;

I do:

	int nr = to_sensor_dev_attr(attr)->index;

This looks better, and even allows the compiler to do some minor
optimizations.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>